Association football •
Frank Williams (footballer, born 1906) (1906–1982), Welsh football player •
Frank Williams (footballer, born 1908) (1908–?), English football player and manager •
Frank Williams (footballer, born 1917) (1917–1978), Welsh football player •
Frank Williams (footballer, born 1921) (1921–1999), English football player
Australian rules football •
Frank Williams (Australian footballer, born 1884) (1884–1939), Australian rules footballer for St Kilda •
Frank Williams (Australian footballer, born 1888) (1888–1959), Australian rules footballer for Carlton •
Frank Williams (Australian footballer, born 1914) (1914–2005), Australian rules footballer for Carlton and Melbourne
Rugby •
Frank Williams (rugby, fl. 1910s), Welsh rugby union and rugby league footballer of the 1910s •
Frank Williams (English rugby league) (c. 1910–?), English rugby league footballer of the 1930s for England and Warrington •
Frank Williams (rugby union, born 1910) (1910–1959), Welsh international rugby union player
Other sports •
Frank Williams (cricketer) (1876–1946), New Zealand cricketer •
Frank Williams (outfielder) (1918–1987), American baseball player •
Frank Williams (gridiron football) (1932–2006), American gridiron football player •
Frank Williams (Formula One) (1942–2021), British founder and manager of the Williams Formula One team •
Frank Williams (pitcher) (1958–2009), American baseball player •
Frank Williams (cyclist) (born 1964), Sierra Leonean cyclist •
Frank Williams (basketball) (born 1980), American professional basketball player •
Frankie Williams (American football) (born 1993), American football player ==Others==